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d in (-oo:+oo)
(-3/5)*d+1/2 = 3*d+401/10 // - 3*d+401/10
(-3/5)*d-(3*d)+1/2-(401/10) = 0
(-3/5)*d-3*d+1/2-401/10 = 0
-18/5*d-198/5 = 0 // + 198/5
-18/5*d = 198/5 // : -18/5
d = 198/5/(-18/5)
d = -11
d = -11
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